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Subject: [RFC] snd: Add virtio sound device specification

This patch proposes virtio specification for new virtio sound device. Any
feedback would be greatly appreciated. Previous version of the proposal: [1].

Reference implementation is now available and located here:

 * QEMU v4.1.0-rc3 device:

 * Linux kernel 5.2-rc7 driver:

How to use:

1) Set the SND_VIRTIO configuration option in Linux kernel config to
  enable virtio-snd in a guest.

2) QEMU command line must contain virtio-snd-pci device configuration:

  a) ALSA backend:
    -audiodev id=sndbe,driver=alsa,out.try-poll=off,\
    -device virtio-snd-pci

    Polling mode must be disabled because QEMU will freeze until
    playback is stopped.

  b) PulseAudio backend:
    -audiodev id=sndbe,driver=pa,server=/run/user/1000/pulse/native,\
    -device virtio-snd-pci

[1]: https://lists.oasis-open.org/archives/virtio-dev/201905/msg00013.html

Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com>
Signed-off-by: Mikhail Golubev <Mikhail.Golubev@opensynergy.com>

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